Frankfurt 2006 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 34: Poster Quantengase

Q 34.21: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Transport of Bose-Einstein-Condensates in quantum dot potentials — •Michael Hartung, Tobias Paul, Klaus Richter, and Peter Schlagheck — Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany

The rapid progress in the “atom chip” technology permits detailed studies of the dynamics of Bose-Einstein condensates in presence of atomic quantum dot potentials. We particularly focus on the quasi-stationary resonant transport through such a potential [1] as well as on the decay of the associated quasi-bound resonance state. To this end we developed a numerical method to calculate bound states and resonances within the mean-field approximation of the condensate’s dynamics. This approach is combined with the time-dependent calculation of the nonlinear scattering problem, where we use a novel, unambiguous definition of the transmission coefficient for the interacting condensate. We discuss the relation between the decay rate of quasi bound states [2] and the width of scattering resonances. Furthermore we investigate to which extent bound states of the quantum dot potential can be populated via beak-to-beak crossings of scattering resonances [3].

[1] T. Paul, K. Richter, and P. Schlagheck, Phys. Rev. Lett. 94, 020404 (2005)

[2] P. Schlagheck, and T. Paul, cond-mat/0402089

[3] K. Rapedius, D. Witthaut, and H. J. Korsch, cond-mat/0507679